Select the Example That Best Demonstrates the Principle of Observational

Select the example that best demonstrates the principle of observational learning:

A) An employee begins biking to work after the cost of riding the train increases
B) A woman joins a gym to promote weight loss
C) A student selects a healthy snack after seeing another student being praised by the teacher for eating a healthy snack
D) After reading about the harmful health effects of cigarettes, a smoker sets an intention to quit smoking
E) A teenager improves her grades to avoid punishment from her parents